MCP251XFD_REG_FIFOCON
MCP251XFD_REG_FIFOCON(priv->tx->fifo_nr),
MCP251XFD_REG_FIFOCON(ring->fifo_nr), fifo_con);
if (reg == MCP251XFD_REG_FIFOCON(ring->fifo_nr))
addr = MCP251XFD_REG_FIFOCON(tx_ring->fifo_nr);
addr = MCP251XFD_REG_FIFOCON(rx_ring->fifo_nr);